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Written by Administrator
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Saturday, 16 August 2008 21:46 |
Pixels and MegaPixels
Pixel:
Literally a "Pixel" is a combination of the words "Pictorial Elements".
Pixels represent blocks of color arranged in a grid. By looking at the grid of pixels from a sufficient distance we are able to see (visualize) the image.
A printer pixel is the smallest dot a printer can produce. The density or the amount of pixels per inch of picture output determine the picture quality. The more pixels we have in an inch (linear) the higher the image quality.
A screen pixel is the is the smallest area that can be illuminated independently on a monitor.
Megapixel:
1 megapixel = 1,000,000 pixels
In relating to digital photography and other uses, when people use the term 'Megapixel' they mean a figure that is around 1,000,000 pixels. For instance: some 4 megapixels digital cameras can produce pictures which are 2272 x 1704 pixels = 3,871,488 pixels ~ 3.87 megapixels.
In the same manner for 2 megapixel - 1600 x 1200 pixels = 1,920,000 pixels = 1.92 megapixels.
These values vary from one camera to another.
Examples:
1. If you scan at 300 PPI a 6 x 4 inch photo.
The number of pixels your picture file will have is:
(300 x 300) x (6 x 4) = 90,000 x 24 = 2,160,000 pixels = 2.16 megapixel
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